And emerson w



(No Model.)

J. KIDDER, Deod.

F. M. KIDDER & E. W. KEYES, Administrators.

ELEGTRO MEDICAL INDUCTION COIL.

No. 269,794. Patented Dec. 26, 1882.

WITNESSES:

\IEKM ATTORNEY N. Pucks Pmmmw. Minn, n c.

UNITED STATES FRANCIS M. KIDDER, OF NEXV YORK, AND EMERSON WV. KEYES, FBROOK- LYN, N. Y., ADMINISTRATORS OF JEROME KIDDER, DECEASED.

SPECIFICATION forming part of Letters Patent No. 269,794, dated December26, 1882,

Application filed August 9, 1882. (No model.)

To all whom n3 may concern:

Be i t known that we, FRANCIS M. KIDDER and EMERSON W. KEYES, citizensof the United States, residing at New York city, county of 5 New Yorkand State of New York, and at :irooklyn, in the county of Kings andState of New York, respectively, administrators of the estate of JEROMEKiDDER, M. 1)., late a citizen of the city, county, and State of NewYork, I a deceased, (as by reference to the duly certified copy ofletters of administration hereto an nexed will more fully appear,) statethat the said JEROME KlDDER, M. D., invented new and useful Improvementsin Electro-M agnetic Machines, of which the following is aspecification.

This invention relates to electromagnetic machines for remedial or otheruses or purposes; and it consists in certain novel combi- 2onationofparts,hereinafterdescribed,operating to automatically produce anintermittent or other current from a battery or other source ofelectricity.

This invention is illustrated in the accom- 2 panying drawings, in whichFigure l is a perspective view, showing it applied to a machinecontaining also various other features now in general use. Figs. 2, 3,and 4 are a detail view of parts.

Similar letters of rel'eience indicate corresponding parts.

The letterA designates a case inclosing the operative parts of themachine, consisting, among other things, of binding-posts B, forreceiving the electrical conductors.

The letter C denotes a lever, which has its fulcrum on pivots D,arranged in an insulated post, E, and which forms a commutator, ashereinafter explained. This lever carries a 40 spring, F, constituting acircuit-closer. such spring being fastened by rivets orother suitablemeans, and opposite to the free end of the spring is located anelectrode, Gr, consisting of a screw arranged in a post, G, as clearlyshown 5 in Fig. 4. To one end of the lever, moreover, is fixed anarmature, H, which is concomitant to an electro-magnet, I, while at theopposite end of the lever is arranged a weight, J, acting thereon, witha tendency to bring the circhit-closing spring F in contact with theelectrode G, which is the normal position of the lever.

When the machine is applied to use the positive pole of the battery orother source of electricity is connected to the post B and the nega 5tive pole to the post B, the complete circuitot the current being asfollows: From the post B the current passes to the posts G and O, andfrom G to the electrode Gr; thence to the spring F, to the lever 0, tothe post E, to the magnet I, to the post L, and through the switch-arm Mto the post N, to the post P, and the post B. As the armature H isatattracted by the electro-magnet I, the spring F is brought out ofcontact with the electrode G and the current is broken, causing therelease of the armature and allowing the lever O to return to its normalposition. The current being thus again established, the armature isattracted as before, the current is again broken, the armature isreleased, and so on. The lever 0 thus Obtains an oscillating motion,which continues as long as the charge or supply of electricityis keptup, and it follows that an intermittent or pulsating current isproduced.

The functions of the posts 0 P are to receive the connectionsot'thchandles of the apparatus.

Provision is made for adjusting the weight J on the lever O in alongitudinal directionas, for example, by a screw-thread, Jso that themotion of the lever and the ensuing pulsations can be regulated by thatmeans-that is to say, when the weight is set outward the motion of thelever is quickened, while, when it is set inward, such motion islessened, the Weight acting in a similarmanner to the pendulum of aclock. I

On the pivot-shafts of the lever O are arranged spiralsprings K, (one ormore,) one 0 end of each spring being fastened to the post E, Fig. 2,while its other end is fastened to the pivot-shaft, and which is coiledin a direction away from the weight J, so that such spring co-operateswith the weight to return 93 lever O to a normal position in a similarmanner to the spring of a watch. An important function of the springs Kis to prevent oxidation of the bearing ends of the pivot-shaft D-namely, by conducting the electrical current Ioc from the lever O atonce to the post E without allowing it to flow to the pivot ends due tothe connection of the springs to the inner or intermediate portion ofthe pivot-shaft and to the post, so that said pivot ends are leftentirely out of the curient.

If desired, the springs K may be coiled or otherwise arranged to act inopposite directions, thus operating to produce the oscillating motion ofthe lever, and in that case the weight may be omitted. A wheel orsegment, moreover, may be substituted for the lever if found expedient.

hat we claim as new, and desire to secure by Letters Patent, is

1. The combination, substantially as hereinbefore set forth, of anoscillating commutatorlever, O, carrying the circuit-closing spring F,the spiral spring or springs K, connected at one end to the pivot-shaltand at the other to the posts E, arrangedon the pivot-shaft of the leverfor the purpose of preventing oxidation of the bearing ends of suchshaft, the post- E and its connections, the armature H, fixed to one endof the lever, the return-weight J, arranged at the opposite end of thelever, the electrode G, and electro-magnet I, for the purpose specified.

2. The combination, substantially as hereinbefore set forth, of thecommutator-lever or its substitute, the spiral springs K, arranged onthe pivot-shaft ot' the lever to act thereon in opposite directions forproducing or equalizing the oscillating motion of the lever, thecircuitclosiug spring F, electrode Gr, armature H, and electro-magnet I,as specitied.

In testimony whereof we afiix our signatures in presence of twowitnesses.

FRANCIS M. KIDDER, EMERSON W. KEYES, Administrators of J. Kidder, Ill.1)., deceased.

Vitnesses:

O. H. CRAWFORD, E. 0. DEMING.

